I have a 1TB hard drive that I started to shrink because I wanted to create a linux partition. I started shrinking 300GB out of the 500GB free space but after around 20mins there was a black out in my house (first world problems).
So I waited for the power to come back and there is a dskchk when I turn the pc back on. I go to make another partition and it says I can only shrink a maximum of 178.7GB. It says something about defragging so I used Defraggler but I'm still getting the same problem.
Windows build-in disk management could only allow you shrinking about half of the partition size or less. So you should choose 3rd party partition tool to shrink the partition,here is a freeware < http://www.disk-partition.com/free-partition-manager.ht... > you could have a try whether it could work on your operating system.